Coldharbour is the plane of Oblivion that is associated with Molag Bal. It resembles that of Nirn, but the ground is nothing more than sludge; the sky constantly burns, and yet the air is beyond freezing. Even an alternative Imperial Palace, as described in The Doors of Oblivion, is known to be there, but dripping with blood and laden with corpses.[1] Coldharbour is known as one of the most inhospitable realms of Oblivion.

Since Molag Bal's sphere is domination and the enslavement of mortals, and because he is known as the God of Schemes, it is no wonder that any mortal entering the realm is captured, enslaved and turned into one of Molag Bal's Soul Shriven, soulless slaves laboring for eternity under Molag Bal's command.

This realm is known for its vast slave pens and laborers, bleak, dead rocky chasms and twisted, abandoned ruins, some ripped straight out of Nirn such as the Argonian village of Haj Uxith.

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Molag' Bal's own seat of power in Coldharbour is known as Heart's Grief. During the final events of The Elder Scrolls Online, Mannimarco can be found here. It is up to the Vestige to decide whether or not to release him from the grim fate Molag Bal has planned out for him.

With the immense power of the Amulet of Kings, the Vestige was able to vanquish Molag Bal and his forces from their own realm, thus ending the Planemeld once and for all.

In the year 2E 582, Molag Bal tried to merge Nirn with Coldharbour using massive inter-planar machines known as Dark Anchors. With the barrier between realms weakened and the Dragonfires darkened, Molag Bal was able to launch a full-scale invasion of Tamriel. It is up to the Vestige, one of Molag Bal's former slaves, to topple the God of Schemes and the Planemeld in order to save Nirn.